<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			td{
				text-align: center;
			}
		</style>
	</head>
	<body>
		<script type="text/javascript">
			
			var arr4 = [10,20,30,40];
				
			for(var i=0;i<arr4.length;i++)
			{
				console.log(arr4[i]);
			}
			
			for(var i in arr4)
			{
				console.log(arr4[i]);
			}
			
			var arr5 = [
				{id:1,name:"张三丰",age:18},
				{id:2,name:"李四",age:18},
				{id:3,name:"王五",age:18},
			]
			
			document.write("<table border='1'>");
			document.write("<tr>");
			document.write("<td>学号</td><td>姓名</td><td>年龄</td>")
			document.write("</tr>");
			for(var i in arr5)
			{
				document.write("<tr>");
				
				var stu = arr5[i];
				document.write("<td>");
				document.write(stu.id)
				document.write("</td>");
				document.write("<td>");
				document.write(stu.name)
				document.write("</td>");
				document.write("<td>");
				document.write(stu.age)
				document.write("</td>");
				
				document.write("</tr>");
			}
			document.write("</table>");
			
		</script>
	</body>
</html>
